Astudent sets up a controlled experiment to test the effect of a fertilizer on plant growth. they use 2 tomato plants, one is given 1 cup of water every day, 1 cup of fertilizer every week and daily sun and constant temperature. the second plant is given ½ cup of water every day, no fertilizer and sun every other day and constant temperature. using your knowledge of the scientific method why is this not a good experimental design? 1.the second plant should also be given some fertilizer. 2.the second plant had different controls and so it cannot be compared for just the effect of fertilizer 3.the second plant should have a change in temperature 4. the second plant should not have that much water every day. diabetics can now obtain insulin that has been manufactured by what biological advancement? 1.hgp 2.hybridization 3.gene splicing 4.cloning the krebs cycle and electron transport take place in which part of the cell? 1.cytoplasm 2.mitochondria 3.nucleus 4.vacuoles

Experiments in environmental toxicology can sometimes be manipulative experiments in which the researcher actively chooses and manipulates the independent variable. in hunt's study, for example, dosages of bpa were manipulated and the effects were measured. in manipulative studies, the researcher controls all the other variables in the experiment, so any health effects observed in the test subjects can be attributed to differences in the independent variable. in other cases, researchers use natural experiments in which the dependent variable (typically a measure of organism health) is measured under differing contexts that are not manipulated. say, for example, that an accidental chemical spill contaminates five ponds. to determine the possible effects of the toxic chemical on frogs, a researcher could compare the hatching rate of frog eggs laid in those five ponds to the hatching rate of eggs laid in five uncontaminated ponds nearby. this would be an example of a natural experiment because concentrations of the toxic chemical in the ponds were not controlled by the experimenter, but rather resulted from the chemical spill. drag type of experiment on the left to the example of experiment on the right. blood concentrations of bpa in college students are compared to their recent manipulative consumption of canned food items 2. the feeding behavior of fish in streams that receive acidic runoff from strip mines is compared to the feeding behavior of fish in unaffected streams. the deformity rate in baby birds from nests in pesticide-sprayed fields is compared to the deformity rate in birds from nests in unsprayed fields 4 tumor development is compared in mice exposed to five dosages of a known carcinogen in the laboratory foraging activity levels are compared in tadpoles exposed to four concentrations of toxic metals in the laboratory. growth of corn plants is compared in field plots sprayed with three different dosage: s of weed killer 7 bpa concentrations in the urine of people with diabetes are compared to bpa concentrations in the urine of people without diabetes - natural; manipulative

What will happen if deforestation continue to destroy the green plant on the planet

The bacteria inside a tube worm would be analogous to what organism in the ocean ecosystem near the waters surface? a. photosynthetic algae b. shrimp c. clown fish d. parasitic lamprey